One of several 1970s documentaries on the subject of unidentified flying objects (UFO), supporting the view that Earth is visited regularly by extra-terrestrial engines and aliens.
| Actor | Role |
|---|---|
| BBrandon ChaseHimself - Narrator (voice) | Himself - Narrator (voice) |
| WWendelle StevensHimself - United States Air Force (Ret.) (as Lt. Colonel Wendelle Stevens) | Himself - United States Air Force (Ret.) (as Lt. Colonel Wendelle Stevens) |
 Bruce MaccabeeNot listed | Not listed |
| LLawrence CoyneNot listed | Not listed |
| JJesse MarcelNot listed | Not listed |
 Travis WaltonNot listed | Not listed |
| BBetty HillNot listed | Not listed |
| MMarjorie FishNot listed | Not listed |
| WWalter MitchellNot listed | Not listed |
| JJames HarderNot listed | Not listed |
| PPat RoachNot listed | Not listed |
| EEdward GelbNot listed | Not listed |
 Stanton FriedmanNot listed | Not listed |
| BBarney HillHimself | Himself |